<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>条件渲染练习</title>
</head>
<script src="./js/react.development.js"></script>
<script src="./js/react-dom.development.js"></script>
<!-- 引入 babel  将jsx语法 转换为 js语法 -->
<script src="./js/babel.min.js"></script>
<body>
    <div id="root"></div>
</body>
<script type="text/babel">
    
    //是否登录
    let isLogin = true;

    //创建虚拟dom对象
    let vdom;

    // 1. if  else
    if(isLogin){
        vdom =  <div>
            <h3>个人中心</h3>
            <button>退出</button>    
        </div>
    }else{
        vdom = <div>
            <button>登录</button>
            <button>注册</button>    
        </div>
    }

    // 2. 三元运算符
    vdom = isLogin ? <div>
            <h3>个人中心</h3>
            <button>退出</button>    
        </div>
        :   <div>
            <button>登录</button>
            <button>注册</button>    
        </div>



    //渲染dom
    ReactDOM.render(vdom,document.getElementById("root"));



</script>
</html>